404 error page when trying to submit on the ‘whats-new’ form.

I have updated to BP1.5 and running the latest wordpress, single site.

My issue is:

When I try to submit something on the whats new form which is on the activity pages I believe, I will get a 404 error, I have narrowed the issue down to something in my theme as the default BP theme works well.

That form posts by javascript. You’ve not loaded the default javascript file (global.js) in your theme. I think this is probably the problem; see that your filters on your member directory etc don’t work either.